For others:
1) change the 50 to 25 on the timing line
2) resave seuqnce
Open your sequence xml
<?xml version="1.0" encoding="UTF-8"?>
<xsequence BaseChannel="0" ChanCtrlBasic="0" ChanCtrlColor="0" FixedPointTiming="1" ModelBlending="true">
<head>
<version>2017.8</version>
<author/>
<author-email/>
<author-website/>
<song>It's Christmas Time Again</song>
<artist>Backstreet Boys</artist>
<album>It's Christmas Time Again</album>
<MusicURL/>
<comment/>
<sequenceTiming>50 ms</sequenceTiming>
<sequenceType>Media</sequenceType>
<mediaFile>C:\Users\Lilia Meighan\Desktop\Nutcracker Store\01 - It's Christmas Time Again_normalized.mp3</mediaFile>
<sequenceDuration>203.102</sequenceDuration>
<imageDir/>
</head>